CN215638955U

CN215638955U - Pipe shell heat exchanger

Info

Publication number: CN215638955U
Application number: CN202121724650.2U
Authority: CN
Inventors: 廉宁; 周立华
Original assignee: Trane Air Conditioning Systems China Co Ltd
Current assignee: Trane Air Conditioning Systems China Co Ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-01-25
Anticipated expiration: 2031-07-27

Abstract

The application provides a shell and tube heat exchanger. The tube-and-shell heat exchanger comprises a shell and a one-way valve. The shell is formed with a heat exchange cavity. The one-way valve is inserted in the shell. The one-way valve comprises an upper end and a lower end inserted in the heat exchange cavity. The check valve is configured to allow refrigerant to flow from an upper end of the check valve to a lower end of the check valve. So set up, can prevent to mix into the lubricating oil of refrigerant and detain in the gas management subassembly, and then reduce the compressor oil return degree of difficulty, and the noise reduction. And, avoided the compressor to exhaust the impact to the gas management subassembly, and then avoided the vibration of gas management subassembly, reduced the complete machine noise.

Description

Pipe shell heat exchanger

Technical Field

The application relates to the field of air cooling machines, in particular to a shell-and-tube heat exchanger.

Background

In the heating condition of the air-cooled heat pump unit, the refrigerant generally enters from top to bottom. In order to prevent the air absorption and the liquid entrainment, a gas management assembly or a demister is arranged in the heat exchanger. Wherein the bottom of the gas management assembly is normally set to a closed state. Therefore, in a heating condition, partial lubricating oil discharged by the compressor is discharged into the gas management assembly along with the refrigerant, and after the compressor runs for a long time, the lubricating oil is accumulated in the gas management assembly to cause the problem of difficult oil return of the compressor, and in a serious condition, the oil loss of a system is caused. In addition, the compressor exhausts to cause vibration of the gas management assembly, so that the noise of the unit exceeds the standard and the reliability is high.

SUMMERY OF THE UTILITY MODEL

The present application provides a shell and tube heat exchanger designed to prevent the retention of lubricating oil in a gas management assembly.

The application provides a shell and tube heat exchanger, wherein includes:

a housing formed with a heat exchange cavity; and

a one-way valve inserted in the housing, the one-way valve including an upper port and a lower port inserted in the heat exchange cavity, the one-way valve configured to allow refrigerant to flow from the upper port of the one-way valve to the lower port of the one-way valve.

Optionally, the shell-and-tube heat exchanger further comprises a gas management assembly assembled at the top of the heat exchange cavity, the gas management assembly is provided with a gas collection cavity, and a gas inlet and a gas outlet which are communicated with the gas collection cavity, the gas inlet is communicated with the heat exchange cavity, the gas outlet is communicated with an upper port of the check valve, and a lower port of the check valve penetrates through the gas management assembly and is inserted into the heat exchange cavity.

Optionally, the shell-and-tube heat exchanger further includes an annular sleeve assembled to the gas management assembly and sleeved outside the check valve, the annular sleeve includes a sleeve body and a mounting flange radially protruding from an inner surface of the sleeve body, the check valve is assembled to the mounting flange, the sleeve body includes an upper sleeve body section located on an upper side of the mounting flange and a lower sleeve body section located on a lower side of the mounting flange, the upper sleeve body section is provided with a gas distribution hole, the gas distribution hole communicates with the gas collection chamber and the gas outlet, and the lower sleeve body section passes through the gas management assembly and is inserted into the heat exchange chamber.

Optionally, the shell-and-tube heat exchanger further includes an impact-proof plate assembled to the lower section of the sleeve body, the impact-proof plate faces the lower port of the check valve, and a discharge port through which the refrigerant flows into the heat exchange cavity is formed between the impact-proof plate and the lower port of the check valve.

Optionally, one of the mounting flange and the check valve is provided with a clamping groove, the other one of the mounting flange and the check valve is provided with a clamping pin, the clamping groove comprises a clamping groove front section extending in the axial direction of the annular sleeve and a clamping groove rear section extending in the circumferential direction of the annular sleeve, the clamping groove front section is communicated with the clamping groove rear section, and the clamping pin is clamped into the clamping groove front section and clamped in the clamping groove rear section.

Optionally, the sleeve body is provided with a plurality of corresponding clamping grooves and a plurality of clamping pins in the axial direction of the sleeve body, and the clamping grooves and the clamping pins are clamped in a one-to-one corresponding mode.

Optionally, the shell-and-tube heat exchanger further comprises a locking assembly, and the clamping pin is fixed in the rear section of the clamping groove through the locking assembly.

Optionally, the mounting flange is provided with an internal thread, the outer wall of the check valve is provided with an external thread, and the internal thread is connected with the external thread.

Optionally, the shell-and-tube heat exchanger further includes a reinforcing plate, and the reinforcing plate is connected to the annular sleeve and the shell.

Optionally, the shell-and-tube heat exchanger further comprises a flange, the flange is connected with the top end of the upper section of the sleeve body and the shell, and the flange is provided with a through hole opposite to the upper port of the one-way valve.

The application provides a shell and tube heat exchanger, including the check valve, the check valve is inserted and is arranged in the casing, and the lower port of check valve inserts and arranges the heat transfer chamber in, and the circulation direction of check valve is for following the port flow down to the port. When the shell-and-tube heat exchanger is used as a condenser, the upper port of the one-way valve is used as an inlet of refrigerant, a large amount of refrigerant can flow in through the upper port of the one-way valve and flow to the heat exchange cavity from the lower port of the one-way valve, and therefore lubricating oil mixed with the refrigerant can be prevented from being retained in the gas management assembly, and the oil return difficulty of the compressor is further reduced. And, avoided the compressor to exhaust the impact to the gas management subassembly, and then avoided the vibration of gas management subassembly, reduced the complete machine noise.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 shows a front view of a shell and tube heat exchanger of the present application;

FIG. 2 is a schematic structural diagram of a one-way valve sleeve of a tube-shell heat exchanger provided by the present application disposed in an annular sleeve;

fig. 3 shows a schematic view of the construction of the annulus of the shell and tube heat exchanger of fig. 2;

fig. 4 is a front view of a partial area a of the shell and tube heat exchanger shown in fig. 1;

fig. 5 is a schematic structural view of a check valve of the shell-and-tube heat exchanger shown in fig. 2;

FIG. 6 is a top plan view of the check valve of FIG. 5 in a closed position;

fig. 7 is a plan view of the check valve shown in fig. 5 in a conducting state.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The application provides a shell and tube heat exchanger, including casing and check valve wherein. The shell is formed with a heat exchange cavity. The check valve is inserted in the shell and comprises an upper port and a lower port inserted in the heat exchange cavity, and the check valve is arranged to allow refrigerant to flow from the upper port of the check valve to the lower port of the check valve.

The application provides a shell and tube heat exchanger includes casing and check valve. The shell is formed with a heat exchange cavity. The check valve is assembled on the shell. The check valve comprises an upper port and a lower port inserted in the heat exchange cavity. The check valve is set to allow the refrigerant to flow to the lower port of the check valve from the upper port of the check valve, so that the lubricating oil mixed with the refrigerant can be prevented from being retained in the gas management assembly, and the oil return difficulty of the compressor is reduced. And, avoided the compressor to exhaust the impact to the gas management subassembly, and then avoided the vibration of gas management subassembly, reduced the complete machine noise.

Fig. 1 shows a schematic structural view of a shell-and-tube heat exchanger 1 according to the present application. Fig. 2 is a schematic structural diagram of the check valve 10 of the tube-shell heat exchanger 1 provided by the present application sleeved in the annular sleeve 13.

As shown in fig. 1 and 2, the shell and tube heat exchanger 1 includes a shell 2 and a check valve 10. The housing 2 is formed with a heat exchange chamber 3. The check valve 10 is inserted into the housing 2, and includes an upper port 11 and a lower port 12 (refer to fig. 5) inserted into the heat exchange chamber 3, and the check valve 10 is provided to allow the refrigerant to flow from the upper port 11 to the lower port 12.

The shell-and-tube heat exchanger 1 further comprises heat exchange tubes 24 arranged in the heat exchange chamber 3. The refrigerant and the heat exchange tubes 24 exchange heat in the heat exchange chamber 3. In the heating condition, the shell-and-tube heat exchanger 1 is used as a condenser, refrigerant flows in from the upper port 11 to exchange heat with the heat exchange tubes 24 in the heat exchange chamber 3, and liquid refrigerant is discharged from the bottom opening 37 of the shell 2. So set up, a large amount of refrigerants can flow in through the last port 11 of check valve 10 to directly flow in heat transfer chamber 3 from the lower port 12 of check valve 10, no longer flow in heat transfer chamber 3 through the gas management subassembly, consequently, can prevent to mix into the lubricating oil of refrigerant and be detained in the gas management subassembly, and then reduce the compressor oil return degree of difficulty. And, avoided the compressor to exhaust the impact to the gas management subassembly, and then avoided the vibration of gas management subassembly, reduced the complete machine noise.

In some embodiments, the shell and tube heat exchanger 1 may include a gas management assembly 5 assembled on top of the heat exchange chamber 3. In the cooling condition, the tube-in-tube heat exchanger 1 is used as an evaporator, refrigerant flows in from the bottom opening 37 of the shell 2 and exchanges heat with the heat exchange tubes 24 in the heat exchange cavity 3, and gas refrigerant formed after heat exchange can be sucked into the gas management component 5 and then discharged. Specifically, the gas management assembly 5 is provided with a gas collection cavity 7, and a gas inlet 8 and a gas outlet 9 which are communicated with the gas collection cavity 7, wherein the gas inlet 8 is communicated with the heat exchange cavity 3, the gas outlet 9 is communicated with an upper port 11 of a one-way valve 10, and a lower port 12 of the one-way valve penetrates through the gas management assembly 5 and is inserted into the heat exchange cavity 3. In the heat exchange cavity 3, gas refrigerant formed after heat exchange is sucked into the gas collection cavity 7 from the gas inlet 8 and is discharged through the gas outlet 9 and the upper port 11. So, under the refrigeration operating mode, upper port 11 can also be used as the gas refrigerant export, has avoided the trompil in other positions of casing 2, has reduced the trompil quantity on casing 2, has improved casing 2's intensity. Gas inlets 8 may be provided at the top of the gas management assembly 5 to mitigate the phenomenon of gas entrainment. In some embodiments, the shell and tube heat exchanger 1 further comprises a demister.

Fig. 3 shows a schematic view of the annular sleeve 13 of the shell-and-tube heat exchanger 1 shown in fig. 2. Fig. 4 is a schematic illustration of the structure of a partial region a of the shell-and-tube heat exchanger 1 shown in fig. 1. Referring to fig. 2, 3 and 4, the tube-in-tube heat exchanger 1 further includes an annular sleeve 13 assembled to the gas management assembly 5, and the annular sleeve 13 may be inserted into the gas outlet 9 and sleeved outside the check valve 10. Specifically, the annular sleeve 13 includes a sleeve body 14 and a mounting flange 15 radially protruding from an inner surface of the sleeve body 14, wherein the check valve 10 is assembled to the mounting flange 15. The direction in which the upper port 11 of the non-return valve 10 is directed towards the lower port 12 coincides with the axial direction of the annular sleeve 13. The sleeve body 14 comprises an upper sleeve body section 16 on the upper side of the mounting flange 15 and a lower sleeve body section 17 on the lower side of the mounting flange 15, wherein the upper sleeve body section 16 is provided with gas distribution holes 18, and the gas distribution holes 18 communicate the gas collection chamber 7 and the gas outlet 9. The lower section 17 of the sleeve body passes through the gas management assembly 5 and is inserted into the heat exchange chamber 3. Thus, on the one hand, the installation of the check valve 10 is achieved; on the other hand, under the refrigeration condition, the check valve 10 is closed, and the gas refrigerant in the heat exchange cavity 3 enters the gas collection cavity 7 from the gas inlet 8 and is discharged through the gas distribution hole 18 and the gas outlet 9, so that the flow path of the gas refrigerant is prevented from being blocked.

It should be noted that, in a heating condition, when the refrigerant flows into the upper port 11 of the check valve 10, a part of the refrigerant will flow out from the gas distribution holes 18, and since the flow area at the upper port 11 is much larger than the flow area of the gas distribution holes 18, it is ensured that most of the refrigerant can flow to the heat exchange chamber 3 through the check valve 10.

In some embodiments, the plurality of gas distribution holes 18 are evenly distributed circumferentially about the upper sleeve body section 16 to provide a more even and rapid distribution of gas pressure of the gaseous refrigerant to the upper end of the shell 2. In addition, it should be noted that the number and size of the gas distribution holes 18 and the number and size of the gas inlets 8 are optimally designed in combination to ensure a reasonable suction pressure drop under the refrigeration condition.

With continued reference to fig. 2, in some embodiments, the shell and tube heat exchanger 1 further comprises a flange 34, the flange 34 being connected to the top end of the upper sleeve body section 16 and the shell 2, the flange 34 being provided with a through hole 35 directly opposite to the upper port 11 of the check valve 10. In this embodiment, the flange 34 also serves as a connecting medium for connecting the sleeve body 14 to the housing 2, so that the sleeve body 14 is more firmly and reliably connected to the housing 2. The flange 34 is annular and has a through hole 35 in the middle. The through hole 35 communicates with the sleeve body 14 and the upper port 11, and ensures that the refrigerant can smoothly flow into the heat exchange chamber 3. Suction means (for example a pump) for sucking air from the heat exchange chamber 3 outwards may be connected to the flange 34.

With continued reference to fig. 2 and 4, in some embodiments, the shell and tube heat exchanger 1 further includes a shock plate 19 assembled to the lower sleeve body section 17. The impact-proof plate 19 faces the lower port 12 of the one-way valve 10, and a discharge port 20 for the refrigerant to flow into the heat exchange cavity 3 is arranged between the impact-proof plate 19 and the lower port 12 of the one-way valve 10. Under the heating working condition, when the refrigerant was annotated from the last port 11 of check valve 10, can cause the impact to the heat exchange tube 24 of heat exchange chamber 3 bottom, based on this, can set up protecting against shock board 19 and shelter from down port 12, utilize protecting against shock board 19 to bear the impact of refrigerant, make the refrigerant cushion through protecting against shock board 19 earlier, rethread discharge port 20 flows into heat exchange chamber 3, can reduce the impact to heat exchange tube 24 from this, plays the effect of protection heat exchange tube 24. In some embodiments, the impact plate 19 has a U-shaped cross-section, and the impact plate 19 can be connected to the bottom end of the lower section 17 of the sleeve body. Specifically, two side flanges of the impact-proof plate 19 with the U-shaped structure are connected with the lower section 17 of the sleeve body, the middle part of the impact-proof plate is opposite to the lower port 12, and a discharge port 20 is formed in a gap between the lower section 17 of the sleeve body and the middle part of the impact-proof plate.

As shown in fig. 1, in some embodiments, the shell and tube heat exchanger 1 further comprises a strengthening plate 36. Annular sleeve 13 and casing 2 are connected to reinforcing plate 36, make annular sleeve 13 more firm with being connected of casing 2, utilize triangle-shaped stability principle, connect reinforcing plate 36 between the inner wall of casing 2 and the lateral wall of annular sleeve 13, make casing 2, annular sleeve 13 and reinforcing plate 36 two liang of cross-sections after connecting be triangle-shaped to strengthen annular sleeve 13 and connect in casing 2's stability.

Fig. 5 is a schematic view of the check valve 10 of the shell-and-tube heat exchanger 1 shown in fig. 2. Fig. 6 is a plan view of the check valve 10 shown in fig. 5 in a closed state. Fig. 7 is a plan view of the check valve 10 shown in fig. 5 in a conducting state. As shown in fig. 5, 6, and 7, the check valve 10 includes a valve cylinder 21, a stem 22, and at least two valve plates 23. Wherein both ends of the valve stem 22 are supported on the inner wall of the valve cylinder 21. At least two valve plates 23 are attached to both sides of the stem 22 along the axis of the stem 22. Under the refrigeration working condition of the air-cooled heat pump unit, the refrigerant flows from the lower end of the shell 2 to the upper end of the shell 2, at least two valve plates 23 are unfolded towards the inner wall of the valve cylinder 21 under the action of airflow (as shown in fig. 6), and the one-way valve 10 is in a stop state. In the heating condition of the air-cooled heat pump unit, the refrigerant flows from the upper end of the casing 2 to the lower end of the casing 2. At least two valve plates 23 are attached downwards under the action of air flow to form a whole (as shown in fig. 7), and the check valve 10 is in a conducting state.

Referring again to fig. 3 and 5, in some embodiments, one of the mounting flange 15 and the check valve 10 is provided with a detent 25 and the other is provided with a detent 26. The card slot 25 includes a card slot front section 27 extending in the axial direction of the annular sleeve 13 and a card slot rear section 28 extending in the circumferential direction of the annular sleeve 13. The card slot front section 27 is communicated with the card slot rear section 28, and the card foot 26 is clamped in from the card slot front section 27 and is clamped in the card slot rear section 28. In this embodiment, the mounting flange 15 is circumferentially provided with a locking groove 25. The top end of the one-way valve 10 is provided with clamping feet 26 corresponding to the number of the clamping grooves 25. The check valve 10 is connected to the mounting flange 15 by the snap fit of the snap groove 25 and the snap leg 26, thereby connecting the check valve 10 to the annular sleeve 13. In this manner, removal and installation of the check valve 10 is also facilitated. The card slot 25 includes a front card slot section 27 and a rear card slot section 28 in communication with each other. The card foot 26 of check valve 10 passes through draw-in groove anterior segment 27 and rotates to draw-in groove back end 28 to make card foot 26 inlay locate in draw-in groove back end 28, prevent to take place the pine easily and take off the phenomenon at the in-process that check valve 10 and mounting flange 15 are connected, be convenient for follow-up staff's operation. In some embodiments, the card slot 25 is an L-shaped configuration. So, simple structure, and the joint is effectual.

In some embodiments, a plurality of clamping grooves 25 and a plurality of clamping feet 26 are correspondingly arranged in the axial direction around the sleeve body 14, and the clamping grooves 25 and the clamping feet 26 are correspondingly clamped one by one. A plurality of slots 25 are provided in the mounting flange 15. A plurality of catches 26 are provided at the top edge of the valve barrel 21. The number and position of the plurality of card slots 25 correspond to the number and position of the plurality of card pins 26 one by one. In the installation process of the valve cylinder body 21 and the installation flange 15, each clamping groove 25 and each clamping foot 26 are correspondingly clamped one by one, so that the connection between the valve cylinder body 21 and the installation flange 15 is more stable and reliable. In some embodiments, the number of the card slots 25 and the card feet 26 may be 1, 2, 3, 4, etc. From the economical and reliable viewpoint, it is preferable that the number of the card slots 25 and the number of the card legs 26 are 3.

Referring again to fig. 2, in some embodiments, the shell and tube heat exchanger 1 further includes a latch assembly 29. The locking feet 26 are secured in the rear section 28 of the locking slot by a locking assembly 29. In this embodiment, the clip 26 is provided with a mounting hole 30. The mounting flange 15 is provided with attachment holes 31 corresponding to the number of the mounting holes 30. The attachment hole 31 corresponds to the card slot rear section 28 in the vertical direction and extends from the top end of the card slot rear section 28 to the top surface of the mounting flange 15. After the clip 26 passes through the clip front section 27 and rotates to the clip rear section 28 so that the mounting hole 30 corresponds to the connecting hole 31 in the vertical direction, the locking member 29 is used to pass through the connecting hole 31 from the top to the bottom and is fixed to the mounting hole 30. Therefore, the clamping between the clamping leg 26 and the clamping groove 25 is more stable, and the loosening phenomenon between the check valve 10 and the annular sleeve 13 is prevented. In some embodiments, locking assembly 29 comprises a self-tapping screw.

Referring again to fig. 3 and 5, in some embodiments, the mounting flange 15 is provided with internal threads 32. The outer wall of the non-return valve 10 is provided with an external thread 33. The internal thread 32 is connected with the external thread 33. In this embodiment, the mounting flange 15 and the check valve 10 may also be threadably connected. The internal threads 32 of the mounting flange 15 are sized to match the external threads 33 of the check valve 10 and, upon rotation, the check valve 10 is attached to the mounting flange 15. Thus, the check valve 10 is convenient to mount and dismount.

The technical solutions disclosed in the embodiments of the present application can complement each other without generating conflicts.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A shell and tube heat exchanger, comprising:

a housing formed with a heat exchange cavity; and

2. A shell and tube heat exchanger according to claim 1, further comprising a gas management assembly assembled to the top of the heat exchange chamber, the gas management assembly being formed with a gas collection chamber and being provided with a gas inlet and a gas outlet communicating with the gas collection chamber, the gas inlet communicating with the heat exchange chamber, the gas outlet communicating with the upper port of the check valve, the lower port of the check valve passing through the gas management assembly and being inserted into the heat exchange chamber.

3. A shell and tube heat exchanger according to claim 2, further comprising an annular sleeve assembled to the gas management assembly and fitted over the check valve, the annular sleeve comprising a sleeve body and a mounting flange radially protruding from an inner surface of the sleeve body, the check valve being assembled to the mounting flange, the sleeve body comprising an upper sleeve body section located above the mounting flange and a lower sleeve body section located below the mounting flange, the upper sleeve body section being provided with gas distribution holes communicating the gas collection chamber and the gas outlet, the lower sleeve body section passing through the gas management assembly and being inserted into the heat exchange chamber.

4. A shell and tube heat exchanger according to claim 3, characterized in that the shell and tube heat exchanger further comprises a baffle assembled to the lower section of the sleeve body, the baffle facing the lower port of the check valve, and a discharge port for refrigerant to flow into the heat exchange chamber being provided between the baffle and the lower port of the check valve.

5. A shell and tube heat exchanger according to claim 3, wherein one of the mounting flange and the one-way valve is provided with a snap groove, and the other is provided with a snap leg, the snap groove comprising a snap groove front section extending in the axial direction of the annulus and a snap groove rear section extending in the circumferential direction of the annulus, the snap groove front section communicating with the snap groove rear section, and the snap leg being snapped from the snap groove front section and snapped into the snap groove rear section.

6. A shell and tube heat exchanger according to claim 5, characterized in that a plurality of said clamping grooves and a plurality of said clamping legs are correspondingly arranged in the axial direction around the sleeve body, and the clamping grooves and the clamping legs are correspondingly clamped one by one.

7. A shell and tube heat exchanger according to claim 5, characterized in that the shell and tube heat exchanger further comprises a locking assembly, the clamping legs being fixed in the rear section of the clamping grooves by the locking assembly.

8. A shell and tube heat exchanger according to claim 3, characterized in that the mounting flange is provided with an internal thread and the outer wall of the non-return valve is provided with an external thread, the internal thread being connected with the external thread.

9. A shell and tube heat exchanger according to claim 3, further comprising a reinforcement plate connecting the annular sleeve and the shell.

10. A shell and tube heat exchanger according to claim 3, further comprising a flange connecting the top end of the upper section of the sleeve body and the shell, the flange being provided with a through hole facing the upper port of the one-way valve.